USN-1312-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-1312-1

19th December, 2011

linux vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 11.04

Summary

Several security issues were fixed in the kernel.

Software description

  • linux - Linux kernel

Details

A bug was discovered in the XFS filesystem's handling of pathnames. A local
attacker could exploit this to crash the system, leading to a denial of
service, or gain root privileges. (CVE-2011-4077)

Nick Bowler discovered the kernel GHASH message digest algorithm
incorrectly handled error conditions. A local attacker could exploit this
to cause a kernel oops. (CVE-2011-4081)

A flaw was found in the Journaling Block Device (JBD). A local attacker
able to mount ext3 or ext4 file systems could exploit this to crash the
system, leading to a denial of service. (CVE-2011-4132)

Clement Lecigne discovered a bug in the HFS file system bounds checking.
When a malformed HFS file system is mounted a local user could crash the
system or gain root privileges. (CVE-2011-4330)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 11.04:
linux-image-2.6.38-13-powerpc 2.6.38-13.53
linux-image-2.6.38-13-powerpc64-smp 2.6.38-13.53
linux-image-2.6.38-13-generic-pae 2.6.38-13.53
linux-image-2.6.38-13-versatile 2.6.38-13.53
linux-image-2.6.38-13-generic 2.6.38-13.53
linux-image-2.6.38-13-virtual 2.6.38-13.53
linux-image-2.6.38-13-server 2.6.38-13.53
linux-image-2.6.38-13-omap 2.6.38-13.53
linux-image-2.6.38-13-powerpc-smp 2.6.38-13.53

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

CVE-2011-4077, CVE-2011-4081, CVE-2011-4132, CVE-2011-4330